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3 General venting
16
Installation & Operation Manual
Requirements for installation in
Canada
1. Installations must be made with a vent pipe system
certified to ULC-S636.
IPEX is an approved vent manufacturer in Canada
supplying vent material listed to ULC-S636.
2. The first three (3) feet of plastic vent pipe from the
appliance flue outlet must be readily accessible for visual
inspection.
3. The components of the certified vent system must not be
interchanged with other vent systems or unlisted
pipe/fittings.
4. The 2" and 3" Concentric Vent Kits available from
Lochinvar (see Section 4 – Sidewall Termination – Optional
Concentric Vent) and the 2" and 3" Concentric Vent Kits
available from IPEX are approved for use on the Knight
wall mount boiler. Both kits are listed to the ULC-S636
standard for use in Canada.
Minimum / Maximum allowable
combustion air and vent piping lengths
are as follows:
Combustion Air = 12 equivalent feet minimum / 100
equivalent feet maximum
Vent = 12 equivalent feet minimum / 100 equivalent feet
maximum
When determining equivalent combustion air and vent
length, add 5 feet for each 90° elbow and 3 feet for each
45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2)
45° elbows + (1) concentric vent kit (CVK3003) = 49
equivalent feet of piping.
The appliance output rating will reduce
by up to 1.5% for each 25 feet of vent
length.
NOTICE
Model Kit Number
Equivalent Vent
Length
51 - 106 CVK3008 3 feet
51 - 211 CVK3003 3 feet
Table 3B Concentric Vent Kit Equivalent Vent Lengths
Sizing
The Knight wall mount boiler uses model specific combustion
air intake and vent piping sizes as detailed in Table 3A below.
Model 2" Max Vent/Air 3" Max Vent/Air
51 40 feet 100 feet
81 40 feet 100 feet
106 40 feet 100 feet
151 N/A 100 feet
211 N/A 100 feet
Table 3A Maximum Combustion Air and Vent Piping
Lengths
NOTICE
Increasing or decreasing combustion air or
vent piping sizes is not authorized.